Event: Summer Series

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Opponent	Rating	Result
Sam Stevenson	1329	1 - 0
Janos Mehes	1145	0 - 1
Neil Sotheby	1347	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1140 = (3821 + 400 * (1 - 2)) / 3)